Lusaka, August 16 (RCH/TELESUR)--Zambian police have arrested 133 people protesting against the re-election of President Edgar Lungu after his main opponent Hakainde Hichilema said the vote was rigged, a senior officer said Tuesday.

Lungu narrowly won re-election Monday with 50.35 percent of the vote against 47.63 for his opponent, the Election Commission of Zambia said.

Hakainde Hichilema's United Party for National Development, or UPND, said it would appeal the result at the Constitutional Court, accusing election officials of fraud during the count which began Thursday.

Lungu faced a tough challenge from Hichilema in a campaign to rule over Africa's second-largest copper producer, which has suffered an economic slump due to depressed commodity prices.